Index: gcc/testsuite/c-c++-common/pr33763.c
===================================================================
--- gcc/testsuite/c-c++-common/pr33763.c	(revision 0)
+++ gcc/testsuite/c-c++-common/pr33763.c	(revision 192121)
@@ -0,0 +1,60 @@
+/* PR tree-optimization/33763 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+typedef struct
+{
+  void *a;
+  void *b;
+} T;
+extern void *foo (const char *, const char *);
+extern void *bar (void *, const char *, T);
+extern int baz (const char *, int);
+
+extern inline __attribute__ ((always_inline, gnu_inline)) int
+baz (const char *x, int y)
+{
+  return 2;
+}
+
+int
+baz (const char *x, int y)
+{
+  return 1;
+}
+
+int xa, xb;
+
+static void *
+inl (const char *x, const char *y)
+{
+  T t = { &xa, &xb };
+  int *f = (int *) __builtin_malloc (sizeof (int));
+  const char *z;
+  int o = 0;
+  void *r = 0;
+
+  for (z = y; *z; z++)
+    {
+      if (*z == 'r')
+	o |= 1;
+      if (*z == 'w')
+	o |= 2;
+    }
+  if (o == 1)
+    *f = baz (x, 0);
+  if (o == 2)
+    *f = baz (x, 1);
+  if (o == 3)
+    *f = baz (x, 2);
+
+  if (o && *f > 0)
+    r = bar (f, "w", t);
+  return r;
+}
+
+void *
+foo (const char *x, const char *y)
+{
+  return inl (x, y);
+}
Index: gcc/tree-inline.c
===================================================================
--- gcc/tree-inline.c	(revision 192120)
+++ gcc/tree-inline.c	(revision 192121)
@@ -3836,6 +3836,12 @@
 	goto egress;
 
       if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn))
+          /* For extern inline functions that get redefined we always
+	     silently ignored always_inline flag. Better behaviour would
+	     be to be able to keep both bodies and use extern inline body
+	     for inlining, but we can't do that because frontends overwrite
+	     the body.  */
+	  && !cg_edge->callee->local.redefined_extern_inline
 	  /* Avoid warnings during early inline pass. */
 	  && cgraph_global_info_ready
 	  /* PR 20090218-1_0.c. Body can be provided by another module. */